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19 January, 17:50

If a force does a positive amount of work on an object, does the object's speed increase, decrease, or remain the same? Justify your answer.

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  1. 19 January, 18:10
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    see that there is no dependence on speed, so the work remains constant

    Explanation:

    Work is defined by the expression

    W = F. d

    where the boldface indicates vectors, this equation can be written in scalar form

    W = f d cos θ

    where θ is the angle between force and displacement.

    We see that there is no dependence on speed, so the work remains constant

    The power is

    P = W / t

    P = f d / t

    p = F v

    we see that the power is the one that depends on the speed of the body
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